Combination receiver and transmitter telephone set



O. HAGERUP COMBINATION RECEIVER AND TRANSMITTER TELEPHONE SET rum May 2. 1924 Patented on. 20, 1925.

UNITED sTa rEs PATENT IQFFICE.

o'r'ro naonnor, or unvwoon, rumors.

COMBINATION RECEIVER AND TRANSMITTERTELEPHONE SET.

Application filed May 2,

To all whom it may concern:

Y has reference more particularly to combination sets adapted to be supported on the head of the user. I

Among the objects of the invention are to produce a device of the character. named characterized by' increased convenience, compactness, sensitiveness, freedom from interference, uniform volume of tonev and maximum efficiency. Another object is to provide a device thatvmay be suspended in such a way and in such a position that both hands of the user are left free. Another object is to provide a device wherein the-transmitting may be done without speaking directly into the transmitter, which produces greater uniformity in the volume of tone and' increased sanitary character of the transmitter by preventing the lodgment therein of offensive and insanitary matter from the breath of the user. A still further object is to provide a construction which shall reduce interference from extraneous noises in the transmitter.

Other objects and attendant advantages of the invention will be apparent to persons familiar withthe art from the following detailed description, taken in connection with the accompanying drawing in which I have illustrated one practical and preferred embodiment of the invention, and wherein Fig. 1 is a front elevation showing the device in operative position on the head of the user; r

, Fig. 2 is a front elevation of the combined receiver and transmitter;

Fig. 3 is a central vertical longitudinalsection through the combined receiver and transmitter; and

Fig. A is a rear elevation of receiver and transmitter.

Referring to the drawing, 5 designates'as an entirety a sheet metal casing so formed as to present an upper generally circular the combinedsection 6 and a lower generally circular section 7. In the upper section 6 is mounted the receiver unit designated asfan entirety 1924. Serial No. 710,511.

by 8, the circuit lines of which are connect-- ed to binding posts 9 and 10 mounted in a transverse bar or plate 11 on the back of the casing 5; and in the lower circular section 7 is mounted a microphone receiver unit'designated as an entirety by 12, the circuit lines of which are connected to binding posts 13 and 10,011 the .back of the casing, the central binding post 10 accommodatmg the re turn or ground lines of both the receiver and transmitter. 14 designates the usual cord carrying the three circuit lines 15, 16

and 17 leading to. the binding posts 9', 13 and 10 respectively. In practice the cord 14 is equipped with a plug (not shown) which may be connected into any of a plurality of spring jacks distributed about a district and connected to a telephone exchange. It will be noted that the housing -or casing 5 is of such a shape that the-cord 14; may readily be wrapped about the nar rowed waist thereof and the entire equipment readily carried in the pocket of the user.

The transmitter unit 12 is'rmounted within and"whollysurrounded by, a body of felt 18 or other sound-deadening material. This is very effective to prevent howling and interference from extraneous noises.

The combined receiver and transmitter may be suspended from the head of the user by the simple means illustrated, comprising a forked bail or handle 19 pivoted at its lower end to pins or lugs 20 on op- 'posite sides of the receiver section 6 of the casing, and a spring clasp 21 shaped to fit over the head and attached to the stem of the bail 19 by any suitable form of clip indicated at 22. When thus supported from the head of the user it will be observed that the receiver rests against the ear, while the transmitter is nearer the receiver but out of contact with the cheek, bein immediately below and slightly forwardly of the ear. Also, by reason of the described construction the transmitter is sus endedfrom the receiver in an elastic or exible material, instead of being rigidly connected with the receiver as in known hand sets of this general character. Again, by reason of the described construction, only the lateral sound waves from the mouth strike the transmitter, by which a softer and more uniform volume of tone is transmitted, and by which also the transmitter is maintained in a much more sanitary'condition than where,

into the transmitter. By reason of the flexible or pivotal connection of the instru-'- ment-to the head-piece, it hangs substantially vertical, so that the transmitter lies at a suflicient distance from the cheek of the wearer to catch the sound waves and transmit the speech, while avoiding befoulment by vapors from the breath.

Finally, the device is manifestly useful and convenient to anyone requiring the free use of both hands, such as telephone operators, train despatchers, load despatchers, etc.

I claim- 1. A telephone head set, comprising, in

combination, a. casing, a transmitter and a receiver mounted in said casing in proximate relation, and means engageable with the head of a user for supporting said casing with the receiver against the users ear and the transmitter disposed in proximity to, but spaced from, the users cheek.

2. A telephone head set, comprising, in combination, a casing, a transmitter and a receiver mounted in said casing in proximate relation, and a head-piece attached at one end to said casing and shaped to fit over a users head, said head-piece being adapted to hold the receiver against the users ear and the transmitter in position to receive the' sound waves produced by the users voice.

3. A telephone head set, comprising, in combination, a casing, a transmitter and a receiver mounted in said casing in proxi-' mate relation, and a head-piece pivotally attached to said casing and adapted to suspend the receiver against the users ear and the transmitter spaced from the users cheek.

4. A combined telephone receiver. and

' transmitter, comprising a casing shaped to provide substantially circular upper and lower sections in proximate relation, a receiver un1tmounted 1n said uppersection, a transmltter unlt mounted 1n sa d lower section, binding posts mounted insaid casing substantially at the juncture ofsaidupper and lower sections and operatively connected to said receiver and transmitter, and a cord carrying circuit lines connected to said binding posts.

5. A telephone head set, comprising, in combination, a casing shaped to provide substantially circular upper and lower sections in proximate relation, a receiver unit mounted in said upper section, a transmit-- ter unit mounted in said lower section, a body of sound-deadening material entirely vsurrounding said transmitter unit,- and a head clamp pivotally connected to, and suspending said casing. I

6. A telephone combination, a casing shaped to provide substantially circular upper and lower sechead set, comprising, in

tions, a receiver unit mounted in said upper cally, with said receiver lying agamst the users ear arid said transmitterdisposed in proximate relation to, but spaced from, the

users cheek.

OTTO HAGERUP. 

